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Comparing Glacial-Geological Evidence and Model Simulations of Ice Sheet Change since the Last Glacial Period in the Amundsen Sea Sector of Antarctica.

• Identification_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator:The Pennsylvania State University

Publication_Date:2020

Title:

Comparing Glacial-Geological Evidence and Model Simulations of Ice Sheet Change since the Last Glacial Period in the Amundsen Sea Sector of Antarctica.

Other_Citation_Details:

Joanne S. Johnson, British Antarctic Survey, Cambridge, UK. David Pollard, Pennsylvania State University, University Park, PA, USA. Pippa L. Whitehouse, Durham University, UK. Stephen J. Roberts, British Antarctic Survey, Cambridge, UK. Dylan H. Rood, Imperial College, London, UK. Joerg M. Schaefer, Lamont-Doherty Earth Observatory, NY, USA.

Online_Linkage: http://www.datacommons.psu.edu

Description:

Abstract:

Since the Last Glacial Maximum ~20,000 years ago, the Antarctic Ice Sheet has undergone extensive changes, resulting in a much smaller present-day configuration. Improving our understanding of basic physical processes that played important roles during that retreat is critical to providing more robust model projections of future retreat and sea-level rise. Here, a limited-area nested ice sheet model was applied to the last deglacial retreat of the West Antarctic Ice Sheet in the Amundsen Sea Embayment (ASE), at 5 km resolution. The ice sheet response to climate and sea-level forcing was examined at two sites along the flowlines of Pine Island Glacier and Pope Glacier, close to the Hudson Mountains and Mount Murphy respectively, and the simulated responses compared with ice sheet thinning histories derived from glacial-geological data. The sensitivity of results to selected model parameters was also assessed. The model simulations predict a broadly similar response to ocean forcing in both the central and eastern ASE, with an initial rapid phase of thinning followed by a slower phase to the modern configuration. Although there is a mismatch of up to 5,000 years between the timing of simulated and observed thinning, the modeling suggests that the upstream geological records of ice surface elevation change reflect a response to retreat near the grounding line. The model-data mismatch could be improved by undertaking more-sophisticated regional bedrock/glacial isostatic adjustment modeling including regional variations in mantle viscosity, and spatially varying basal sliding properties on the continental shelf.

Supplemental_Information:

Joanne S. Johnson, British Antarctic Survey, Cambridge, UK.     

David Pollard, Pennsylvania State University, University Park, PA, USA.   

Pippa L. Whitehouse, Durham University, UK.   

Stephen J. Roberts, British Antarctic Survey, Cambridge, UK. 

Dylan H. Rood, Imperial College, London, UK.   

Joerg M. Schaefer, Lamont-Doherty Earth Observatory, NY, USA.   

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date:2020

Currentness_Reference:

publication date

Keywords:

Theme:

Theme_Keyword_Thesaurus:ISO 19115 Topic Categories

Theme_Keyword:climatologyMeteorologyAtmosphere

Theme_Keyword:environment

Theme_Keyword:Ice sheet modeling

Theme_Keyword:West Antarctic Ice Sheet.

Theme_Keyword:Amundsen Sea sector

Theme_Keyword:Deglaciation

Access_Constraints:None.

Use_Constraints:

The University excludes any and all implied warranties, including warranties or merchantability and fitness for a particular purpose.
The University makes no warranty or representation, either express or implied, with respect to the FILES or accompanying documentation, including its quality, performance, merchantability, or fitness for a particular purpose. The FILES and documentation are provided "as is" and the USER assumes the entire risk as to its quality and performance.
The University will not be liable for any direct, indirect, special, incidental, or consequential damages arising out of the use or inability to use the FILES or any accompanying documentation.
The USER is granted permission to translate and add value to the FILES for the use of the FILES on its computer hardware; provided, however, that the USER annually notify the University of any customizing or value-adding work done.

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person:David Pollard

Contact_Organization:Penn State

Contact_Address:

Address_Type:mailing address

Address:

EMS Earth and Environmental Systems Institute

Address:

2217 Earth-Engineering Sciences Building

City:University Park

State_or_Province:Pennsylvania

Postal_Code:16802

Country:USA

Contact_Voice_Telephone:814 865 2022

Contact_Electronic_Mail_Address:pollard@essc.psu.edu

Native_Data_Set_Environment:

Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 4; ESRI ArcCatalog 8.3.0.800

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:Penn State Data Commons

Contact_Address:

Address_Type:mailing and physical address

Address:

115 Land and Water Building

City:University Park

State_or_Province:Pennsylvania

Postal_Code:16802

Country:United States

Contact_Voice_Telephone:(814) 865 - 8792

Contact_Electronic_Mail_Address:datacommons@psu.edu

Distribution_Liability:

The USER shall indemnify, save harmless, and, if requested, defend those parties involved with the development and distribution of this data, their officers, agents, and employees from and against any suits, claims, or actions for injury, death, or property damage arising out of the use of or any defect in the FILES or any accompanying documentation. Those parties involved with the development and distribution excluded any and all implied warranties, including warranties or merchantability and fitness for a particular purpose and makes no warranty or representation, either express or implied, with respect to the FILES or accompanying documentation, including its quality, performance, merchantability, or fitness for a particular purpose. The FILES and documentation are provided "as is" and the USER assumes the entire risk as to its quality and performance. Those parties involved with the development and distribution of this data will not be liable for any direct, indirect, special, incidental, or consequential damages arising out of the use or inability to use the FILES or any accompanying documentation.

Metadata_Reference_Information:

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:Penn State Data Commons

Contact_Position:Metadata Coordinator

Contact_Address:

Address_Type:mailing address

Address:

115 Land and Water Building

City:University Park

State_or_Province:Pennsylvania

Postal_Code:16802

Country:United States

Contact_Voice_Telephone:814-865-8792

Contact_Electronic_Mail_Address:datacommons@psu.edu

Metadata_Standard_Name:FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version:FGDC-STD-001-1998

Metadata_Time_Convention:local time

Metadata_Extensions:

Profile_Name:ESRI Metadata Profile